MODISTools: MODIS Subsetting Tools

Description Usage Arguments Details Value Author(s) See Also Examples

Takes a set of coordinates in either degrees minutes seconds or degrees decimal minutes, and converts them to decimal degrees format (##.#####; -##.#####). The function is flexible to take the input coordinates in several different formats.

1	ConvertToDD(XY, FileSep=NULL, LatColName, LongColName)

`XY`	Input dataset; either the name of an object already in the workspace, or a file to be read in by specifying its file path as a character string.
`FileSep`	If XY is a character string that corresponds to a file path, choose the delimiter character for that file (e.g. "," for comma separated).
`LatColName`	Character string; the name of the column in XY containing latitude data.
`LongColName`	Character string; the name of the column in XY containing longitude data.

There is flexibility in the layout of each degrees input format. For example, N-S/E-W can be described by positive-negative coordinates or by using respective letters at the end of each coordinate. For coordinates in degrees minutes seconds to be converted requires three numbers - degrees, minutes, and seconds - each separated by a single non-numeric character (e.g. 51d24'51.106"N 0d38'56.018"W). For coordinates in degrees minutes to be converted requires just two numbers - degrees and minutes (e.g. 51d24.106'N 0d38.018'W). Coordinates should not contain spaces in between the numbers. The degrees format does not have to be consistent throughout the data set.

Output is a data frame of same dimensions as input, with each value converted to decimal degrees, named "DD.lat" and "DD.long".

Sean Tuck

MODISSubsets